Sheetrock cutting instrument



FIG. 1 is a bottom, front and left side perspective view of a sheetrock cutting instrument showing our new design, the slidable member being shown unattached;

FIG. 2 is a left side elevational view;

FIG. 3 is a right side elevational view;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view;

FIG. 6 is a front elevational view; and,

FIG. 7 is a rear elevational view thereof. 

The ornamental design for a sheetrock cutting instrument, as shown and described. 